A new Primary Care Investment Guide from the Harvard Medical School Center for Primary Care outlines evidence-based strategies for strengthening advanced primary care while improving outcomes and lowering costs. Developed with support from the California Health Care Foundation and the Commonwealth Fund, the guide identifies integrated clinical pharmacy services as a key investment alongside behavioral health, care management and population health. Drawing on research, case studies and real-world examples, it offers practical recommendations for policymakers, employers, health plans and provider organizations pursuing primary care transformation.